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Hybrid and Pureline Hard Winter Wheat Yield and Stability

^a Dep. of Plant and Soil Sci., Oklahoma State Univ., Stillwater, OK 74078-6028
^b Dep. of Statistics, Oklahoma State Univ., OK 74078

View larger version (30K): [in a new window]   Fig. 1. Mean grain yield of long-term check purelines (‘TAM W-101’ and ‘Triumph 64’) by year and location with linear regressions plotted for (A) Goodwell irrigated, (B) Stillwater, (C) Lahoma, and (D) Altus, OK.

View larger version (31K): [in a new window]   Fig. 2. Linear regressions for relative yield of hybrids (solid line with x symbols) and purelines (dashed line with square symbols) by year for (A) Goodwell irrigated, (B) Stillwater, (C) Lahoma, and (D) Altus, OK. The check mean reference (dotted line) is equal to 1.0 by definition.

View larger version (32K): [in a new window]   Fig. 3. Mean grain yield of hybrids (solid line with x symbols) and purelines (dashed line with square symbols) against a check environmental index.

View larger version (25K): [in a new window]   Fig. 4. Comparison of (A) 95% and (B) 85% confidence intervals (CI) of hybrids (solid lines) and purelines (dashed lines) to approximate a test of differences between the two populations at = 0.01 and 0.05, respectively.